Pliny the Elder mentioned in the encyclopedic Naturalis historia a report by Cicero saying that a handwritten version of the Iliad by Homer would have fit in a nut: "in nuce inclusam Iliadem Homeri carmen in membrana scriptum tradit Cicero". In Hamlet (Act 2, Scene 2) the title character exclaims: "O God, I could be bounded in a nutshell, and count myself a King of infinite space". But the salient point of my understanding is that there is evidence of teleology. The expression further gave rise to the journalistic term nut graph, short for nutshell paragraph. This is extemely difficult for me to put in a nutshell because of the complexities around the nature of time or our human perception of time. The expression "in a nutshell" (of a story, proof, etc.) means "in essence", metaphorically alluding to the fact that the essence of the nut - its edible part - is contained inside its shell. Shells can also be used as loose-fill packing material, to protect fragile items in shipping. Their high porosity makes them also ideal in the production of activated carbon by pyrolysis. Shells from pecans, almonds, Brazil nuts, acorns, and most other nuts are useful in composting. Walnut shells can be used for cleaning and polishing, as a filler in dynamite, and as a paint thickening agent.
Most nutshells are useful to some extent, depending on the circumstances.
It covers and protects the kernel, which may be edible.
Most nutshells are inedible and are removed before eating the nut meat inside.
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